How can I write ansible condition when not changed?

Question

I'm trying to write a when condition when registered value changed, failed, skipped and ok (desired state) cases but I can write for all 3 scenario other than ok

tasks
  - name: task 1
    module:
    register: result
  - name: task 2
    module
    when: result is failed
  - name: task 3
    module
    when: result is succeeded
  - name: task 4
    module
    when: result is skipped

I need help to write when condition if the task 1 status is "ok". Kindly suggest